body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height: 1.6;
      margin: 0;
      padding: 0;
      background: #f7f7fb;
      color: #222;
    }
    header {
      background: #2d3e50;
      color: #fff;
      padding: 2.5rem 1.5rem;
      text-align: center;
    }
    header h1 {
      margin: 0 0 0.5rem;
      font-size: 2rem;
    }
    header p {
      margin: 0;
      font-size: 1rem;
      opacity: 0.9;
    }
    main {
      max-width: 800px;
      margin: 2rem auto;
      padding: 0 1.5rem 3rem;
      background: #fff;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
      border-radius: 12px;
    }
    h2 {
      margin-top: 2rem;
      font-size: 1.4rem;
      color: #1f2933;
    }
    p {
      margin: 0.75rem 0;
    }
    ul {
      margin: 0.75rem 0 0.75rem 1.5rem;
    }
    li {
      margin-bottom: 0.35rem;
    }
    .highlight {
      background: #f0f4ff;
      border-left: 4px solid #3b82f6;
      padding: 0.75rem 1rem;
      margin: 1.5rem 0;
      border-radius: 8px;
      font-size: 0.95rem;
    }
    .summary {
      background: #f9fafb;
      border-radius: 10px;
      padding: 1rem 1.25rem;
      margin-top: 2rem;
    }
    .summary h3 {
      margin-top: 0;
      margin-bottom: 0.5rem;
      font-size: 1.1rem;
    }
    footer {
      max-width: 800px;
      margin: 0 auto 2rem;
      padding: 0 1.5rem;
      font-size: 0.9rem;
      color: #555;
    }
    footer h3 {
      margin-top: 0;
      font-size: 1rem;
    }
    a {
      color: #2563eb;
      text-decoration: none;
    }
    a:hover {
      text-decoration: underline;
    }
    sup {
      font-size: 0.7em;
    }
    .nav-home {
  font-size: 0.9rem;
  color: #c8d4e0;
  text-decoration: underline;
}
.nav-home:hover {
  text-decoration: underline;
}
.footer-nav a {
  color: #2563eb;
  text-decoration: none;
  font-size: 0.95rem;
}
.footer-nav a:hover {
  text-decoration: underline;
}